I've received an email about an American series called Planet of the Dogs. Here's the information if you want to check it out:
"We are introducing our Planet of the Dogs series of children's books to the UK. For more information and sample chapters, please visit http://www.planetofthedogs.net/
For information on our involvement with therapy dog reading programs, please visit http://barkingplanet.typepad.com/
Barking Planet Productions"